Optical performance evaluation of blue tandem top-emitting OLED device

Kim, Jin Young; Yang, Hye In; Kim, Dong Kwang; Pode, Ramchandra; Kwon, Jang Hyuk

doi:10.1016/j.orgel.2023.106810

Cited by 3 publications

(3 citation statements)

References 28 publications

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“…Besides, the FWHM increases with increased thickness of ITO. We could explain this phenomenon by considering the following equation for the FWHM [13].…”

Section: Characteristics Of Teoleds With Al and Al/ito Anodesmentioning

confidence: 99%

“…Due to the unique top-emitting direction of the TEOLEDs, the driving elements on the substrate will not block the light path and can theoretically enable a 100% aperture ratio of the display unit, which have a broad application prospect in the field of display [8][9][10]. Besides, the emission spectrum of TEOLEDs tends to be narrower due to the micro-cavity effect, thus improving the efficiency and color purity of devices, promoting the applications in ultra-highdefinition displays and micro-displays [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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High-efficiency top-emitting organic light-emitting diodes based on metal/ITO composite electrodes

Zhao,

Pi,

et al. 2024

Phys. Scr.

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High-performance top-emitting organic light-emitting diodes (TEOLEDs) integrating the metal/ITO composite anodes were developed. The results revealed that covering the surface of Al anode with ITO layer could effectively improve the charge injection efficiency and balance the hole-electron charge. The effect of the thickness of ITO on the performance of TEOLEDs with Al/ITO anodes was further studied. The TEOLEDs with Al/ITO (5 nm) anode showed optimized performance, with the current efficiency (CE) and external quantum efficiency (EQE) enhanced by 40.0% and 34.5% compared to that of the OELD with pure Al anode, and increased by 93.1% and 33.5% compared to that of bottom-emitting OLEDs. In addition, the full width at half maximum (FWHM) was narrowed to 36 nm due to the micro-cavity effect of the top-emitting structure and the turn-on voltage decreased to as low as 2.3 V owing to the efficient charge injection and well-matched energy level. In addition, TEOLEDs using Ag/ITO as anode exhibited a slow roll-off of CE and EQE and a narrower FWHM of 30 nm, greatly improving the color purity. The strategy is simple and can significantly improve the efficiency of the TEOLEDs, which promotes the applications of OLEDs in the fields of ultra-high-definition displays and micro-displays.

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“…Besides, the FWHM increases with increased thickness of ITO. We could explain this phenomenon by considering the following equation for the FWHM [13].…”

Section: Characteristics Of Teoleds With Al and Al/ito Anodesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-efficiency top-emitting organic light-emitting diodes based on metal/ITO composite electrodes

Zhao,

Pi,

et al. 2024

Phys. Scr.

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“…Here, singlet excitons only are spin allowed and so return to their ground state. Thus, priority is given to research or studies that can develop highly efficient blue emitter with color purity 7 , 8 . In this direction, donor–acceptor (D–A) structures that contain bulky moiety provides steric hindrance have been used to reduce the quenching process 9 – 15 .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of high performance based deep-blue OLED with benzodioxin-6-amine-styryl-triphenylamine and carbazole hosts as electroluminescent materials

Dhineshkumar,

Arumugam,

Manikandan

et al. 2024

Sci Rep

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The present study reports synthesis of phenathroimidazole derivatives structures following donor–acceptor relation for high performance deep-blue light emitting diodes. Herein, methyl substituted benzodioxin-6-amine phenanthroimidazoles Cz-SBDPI and TPA-SBDPI derivatives that provide the blue light were designed and synthesized. These Cz-SBDPI and TPA-SBDPI show higher glass transition (Tg) temperatures of 199 and 194 °C and demonstrate enhanced thermal properties. Apart from enhanced thermal stability these compounds also exhibit superior photophysical, electrochemical and electroluminescent properties. The non-doped carbazole based device display improved electroluminescent performances than those of TPA-based devices. The strong orbital-coupling due to decreased energy barrier between Cz-SBDPI transitions result in deep blue emission with CIE—0.15, 0.06. For non-doped Cz-SBDPI device; high L (brightness):12,984 cd/m2; ηc (current efficiency): 5.9 cd/A; ηp (power efficiency): 5.7 lm/W and ηex (external quantum efficiency): 6.2% was observed. The results show that the D–A emitters can serve as simple but also as an effective approach to devise cheap electroluminescent materials that has high efficiency and can serve as OLED devices.

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Deep Learning Prediction of Triplet–Triplet Annihilation Parameters in Blue Fluorescent Organic Light‐Emitting Diodes

Lim,

Kim,

Lee

2024

Advanced Materials

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The triplet–triplet annihilation (TTA) ratio and the rate coefficient (kTT) of TTA are key factors in estimating the contribution of triplet excitons to radiative singlet excitons in fluorescent TTA organic light‐emitting diodes. In this study, we implemented deep learning models to predict key factors from transient electroluminescence (trEL) data using new numerical equations. A new TTA model was developed that considers both polaron and exciton dynamics, enabling the distinction between prompt and delayed singlet decays with a fundamental understanding of the mechanism. In addition, deep learning models for predicting the kinetic coefficients and TTA ratio were established. After comprehensive optimization inspired by photophysics, we achieved determination coefficient values of 0.992 and 0.999 in the prediction of kTT and TTA ratio, respectively, indicating a nearly perfect prediction. The contribution of each kinetic parameter of polaron and exciton dynamics to the trEL curve was discussed using various deep learning models.This article is protected by copyright. All rights reserved

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Optical performance evaluation of blue tandem top-emitting OLED device

Cited by 3 publications

References 28 publications

High-efficiency top-emitting organic light-emitting diodes based on metal/ITO composite electrodes

High-efficiency top-emitting organic light-emitting diodes based on metal/ITO composite electrodes

Fabrication of high performance based deep-blue OLED with benzodioxin-6-amine-styryl-triphenylamine and carbazole hosts as electroluminescent materials

Deep Learning Prediction of Triplet–Triplet Annihilation Parameters in Blue Fluorescent Organic Light‐Emitting Diodes

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